plus, michelle obama scheduled to take the stage to talk up her husband. but there is one thing you should absolutely not expect to hear her say. and how her speech could compare with that of ann romney at the rnc. but first from fox's tuesday night live from charlotte, the democratic national convention is now officially underway. and how is this for timing? today the national debt clock topped $16 trillion for the first time in u.s. history. we'll have more on that a little later with gather are you willis. we'll three hours away from the headliners, including the first lady, michelle obama. she checked out the stage yesterday. president obama says he can not compete with the first lady, calling her the star of the obama family. >> i'm going to be at home and i'm going to be watching her with our girls and i am going to try not to let them see their daddy cry. because when michelle starts talking i start getting all misty. >> shep: tonight's other big speech, the keynote address from none other than julian castro, the mayor of san antonio, texas. he is b